Determine the upper control limit (UCL) and lower control limit (LCL) for an X-Bar chart

1.)Determine the upper control limit (UCL) and lower control limit (LCL) for an X-Bar chartif six samples of subgroup size 3 (n=3) were collected, the mean of the sample averages is 4.7, and the mean of the sample ranges is 0.35. Determine the upper control limit (UCL) and lower control limit (LCL) for an X-Bar chart.

and 2.) Determine the upper control limit (UCL) and lower control limit (LCL) for an R-chart if twenty samples of subgroup size 5 (n=5) were collected for a variable measurement and the mean of the sample ranges equals 4.4.